chart2/source/view/inc/Clipping.hxx

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
   2 /*
   3  * This file is part of the LibreOffice project.
   4  *
   5  * This Source Code Form is subject to the terms of the Mozilla Public
   6  * License, v. 2.0. If a copy of the MPL was not distributed with this
   7  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
   8  *
   9  * This file incorporates work covered by the following license notice:
  10  *
  11  *   Licensed to the Apache Software Foundation (ASF) under one or more
  12  *   contributor license agreements. See the NOTICE file distributed
  13  *   with this work for additional information regarding copyright
  14  *   ownership. The ASF licenses this file to you under the Apache
  15  *   License, Version 2.0 (the "License"); you may not use this file
  16  *   except in compliance with the License. You may obtain a copy of
  17  *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
  18  */
  19
  20 #ifndef _CHART2_CLIPPING_HXX
  21 #define _CHART2_CLIPPING_HXX
  22
  23 #include <basegfx/range/b2drectangle.hxx>
  24 #include <com/sun/star/drawing/PolyPolygonShape3D.hpp>
  25
  26 //.............................................................................
  27 namespace chart
  28 {
  29 //.............................................................................
  30
  31 //-----------------------------------------------------------------------------
  32 /**
  33 */
  34
  35 class Clipping
  36 {
  37     /** This class uses the Liang-Biarsky parametric line-clipping algorithm as described in:
  38             Computer Graphics: principles and practice, 2nd ed.,
  39             James D. Foley et al.,
  40             Section 3.12.4 on page 117.
  41     */
  42
  43 public:
  44     /** @descr  The intersection between an open polygon and a rectangle is
  45             calculated and the resulting lines are placed into the poly-polygon aResult.
  46         @param  rPolygon    The polygon is required to be open, ie. it's start and end point
  47             have different coordinates and that it is continuous, ie. has no holes.
  48         @param  rRectangle  The clipping area.
  49         @param  aResult The resulting lines that are the parts of the given polygon lying inside
  50             the clipping area are stored into aResult whose prior content is deleted first.
  51      */
  52     static void clipPolygonAtRectangle(
  53                                 const ::com::sun::star::drawing::PolyPolygonShape3D& rPolygon
  54                                 , const ::basegfx::B2DRectangle& rRectangle
  55                                 , ::com::sun::star::drawing::PolyPolygonShape3D& aResult
  56                                 , bool bSplitPiecesToDifferentPolygons = true );
  57 };
  58
  59 //.............................................................................
  60 } //namespace chart
  61 //.............................................................................
  62 #endif
  63
  64 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */